| 主权项 |
1. A screw conveyor for introducing organic matter into a biogas digester that is under internal gas pressure, said screw conveyor comprising:
a screw pipe (10) extending in a longitudinal direction and having an inlet opening (30) for organic matter in the region of a first screw pipe end (11) and an outlet opening (40) for the organic matter in the region of a second screw pipe end (12), a conveying screw (20) extending in the longitudinal direction and arranged inside the screw pipe and which is rotatably mounted and can be made to rotate by means of a screw conveyor drive (50, 60), a digester connector (40) for connecting the outlet opening directly to the biogas digester that is under gas pressure, a plug section (80c) in a region between the inlet opening and the outlet opening for compacting the organic matter in order to reduce any passage of gas through the screw conveyor, characterised in that the plug section has an expansion region (23a) in which the passage cross-section between the conveying screw and the screw pipe expands in the conveying direction, and a contraction region (23b) disposed downstream from the expansion region, in which the passage cross-section between the conveying screw and the screw pipe is reduced in the conveying direction. |
